Optimal Placement of UPFC in Distribution Network for Voltage Stability Improvement

摘要

The recent increase in load demand has subjected the existing power network to voltage stability issues, which can subsequently result into overall system blackout when strategic measures are not adopted to maintain the power system stability. The purpose of this study is to analyse and resolve voltage stability related issues in the power system using UPFC. The study was conducted by modelling IEEE 14 bus test systems in MATLAB/Simulink environment and subjecting the systems to sudden load change. Fast voltage stability index was used as indicator for placing the UPFC at the exact locations in the test systems. The simulation results revealed that the test systems operated out of the set voltage stability limit when subjected to the contingency cases. Successive increment of the heavy connected loads subjected the test systems to severe voltage collapse and could not accommodate the anticipated 200% individual load increment. However, the integration of the UPFC at the exact locations in the test systems maintained the connected bus voltages within stability limit.